Sewage treatment plant uses primary secondary & tertiary stages in treating domestic & commercial waste water. The time sewage treated water is reduced for many non portable applications. In commercial establishments it is mandatory to use treated sewage water in flushing & cooling tower.
When any waste water is reclaimed, expected quality of treated water is very high. It is expected to be free of micro-organisms, colour, & odor. So in this situation where high quality of STP treated water is expected ozone technology becomes most effective & efficient. Globally Ozone is used in tertiary treatment for effectively remove colour, odor, and micro-organisms for the sewage water.